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Equity-Based Compensation - Restricted Stock Awards with Service Conditions Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2015
Jan. 31, 2015
Feb. 28, 2014
Jan. 31, 2014
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized equity-based compensation               $ 16,733 $ 24,927 $ 40,115  
Executive Officer | Common stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares issued in period (in shares)     20,000                
Share-based compensation expense             $ 300        
Restricted stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares)               555,680 581,672 3,239,948  
Number of shares, vested (in shares)               766,159 785,820 299,703  
Number of shares forfeited in period (in shares)               626,319 70,299 370,041  
Weighted Average Grant Date Fair Value, Granted (in dollars per share)               $ 8.37 $ 15.48 $ 17.22  
Number of shares issued and unvested (in shares)               2,644,030 3,480,828 3,755,275 1,185,071
Unrecognized equity-based compensation               $ 9,960 $ 18,946 $ 37,780  
Restricted stock | Employees And Executive Officers                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares)         1,377,500            
Vesting period         4 years            
Number of shares, vested (in shares)         344,375            
Number of shares forfeited in period (in shares)               10,000      
Unrecognized equity-based compensation               $ 8,000      
Equity-based compensation expected to be recognized in 2017               6,900      
Equity-based compensation expected to be recognized in 2018               $ 1,100      
Restricted stock | Non-Management Board of Directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares)       18,200              
Restricted stock | Employees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares issued and unvested (in shares)               92,900      
Non-Management - Amended Directors Director Plan | Restricted stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period               6 months      
Non-Management - Amended Directors Director Plan | Restricted stock | Director                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares)           37,500          
Second Amended And Restated Non Management Director Compensation Plan [Member] | Restricted stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Equity-based compensation expected to be recognized in 2017               $ 8,200      
Equity-based compensation expected to be recognized in 2018               1,600      
Share-based compensation expense               8,600 $ 10,100 $ 9,400  
Unrecognized equity-based compensation               10,000      
Equity-based compensation expected to be recognized in 2019               100      
Equity-based compensation expected to be recognized in 2020               $ 100      
Second Amended And Restated Non Management Director Compensation Plan [Member] | Restricted stock | Non-Management Board of Directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares) 72,397 140,416                  
Vesting period 1 year                    
Number of shares, vested (in shares)                 511    
Number of shares forfeited in period (in shares)                 514    
Weighted Average Grant Date Fair Value, Granted (in dollars per share) $ 9.02                    
Second Amended And Restated Non Management Director Compensation Plan [Member] | Restricted stock | Non-Management Board of Directors | Tranche one                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares)               94,391      
Second Amended And Restated Non Management Director Compensation Plan [Member] | Restricted stock | Non-Management Board of Directors | Tranche two                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares, granted (in shares)               45,000